I've documented it in the svn 1.5 book as well. Really, the barrier
to entry isn't very high. :-)

I agree with ghudson and glasser here: I do not want to see
Subversion start inventing its own half-assed security features. It's
a waste of energy, a reinvention of the wheel, and a maintenance
burden. We should use the 'standard library' -- written by security
experts, depended on by millions -- to do our security.